What type of disorder is characterized by a dramatically increased nail curvature of the free edge?

A pincer nail is characterized by a severely increased curvature of the free edge, often resulting in the nail growing inward towards the surrounding skin. This condition can lead to discomfort and even pain, as the nail encroaches upon the adjacent tissue, which can become inflamed or infected. Pincer nails may develop due to several factors, including genetics, trauma, or improper footwear, and they often require professional treatment to manage the symptoms and restore normal nail shape.

In contrast, an ingrown toenail typically refers to a condition where the edge of the toenail grows into the skin of the toe, causing pain and potential infection, but it does not indicate a dramatic increase in curvature of the nail itself. Onychomycosis is a fungal infection of the nail that can cause discoloration and thickening, but it does not primarily involve an increase in curvature. Nail psoriasis can affect nail appearance and can cause pitting, ridges, or even separation from the nail bed, but it is not specifically defined by increased curvature.